Improvement in chilling plowshares



UNITED STATES PATENT OFFICE.

JAMES OLIVER AND HARVEY LITTLE, OF SOUTH BEND, INDIANA.

IMPROVEMENT IN CHILLING PLOWSHARES.

Spcciiication forming part of' Letcls Patent No. l 7,694, (lated June 30, 13517.

To (LZZ whom it may concern:

Beit known that we, JAMES OLIVER and HARVEY LITTLE, of South Bend, in the county of St. Joseph and State of Indiana, have invented a new and Improved Way of Chilling or Hardening Plowshares; and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, which are made a part of this speciiication.

The ordinary process for making chilled or hardened cast-iron shares is very defective, a great loss of labor and metal is experienced, and the greatest precaution fails to insure a perfect operation. This is due to the usual mode of preparing the molds to the arrange- Inent of the chills in relation to it. These are the causes for the sudden conversion of dampness into vapors, which are driven along by the melted mass and lodged against the chill, Where they cause explosions, commonly called popping, and which results in the destruo tion of the mold or causes flaws and other defects in the casting.

Our improvement consists in a new process, which We IIoW proceed to describe. A print or chill-pattern,corresponding with precision to the chill and the part of the share ,which is to be chilled, is fitted onto the share-pattern. IVe now Inold the pattern by placing it face up upon the follow-board. This,when molded, brings the share-face or the concave down in an opposite or reversed position from that occupied at first. TWe then remove the pattern from the mold and place the chill in the impression nia-de bythe chill pattern or print.

In the annexed drawings we have shown plan view of both the top and bottom ilask. (See Figures 1, 2.) The latter is represented with the chill in the mold. Figs. 3, 4, 5, and 6 show, respectively, the sections 8 3, 4 4, 5 5, and 6 6.

It will be perceived that the iron that first enters the mold runs directly to the edge and under the chill. These portions are thus filled at the start of the operation, and the vapors created by the damp mold, the air, and other gases are expelled gradually through the spout. This Inode of casting plowshares insures both safety and nicety of operation or perfect workmanship.

Having now described our improvement, whatwe claim as our invention, and desire to secure by Letters Patent, is-

The process herein described, consisting in placing the surface of the chill in such a position in relation to the other parts of the mold that the melted metal shall first come in contact with the chill at the edge of the share, in the manner and for the purpose herein specified.

JAMES OLIVER. HARVEY LITTLE.

Witnesses:

CHARLES M. HEATON, ROAN CLARKE. 

